x>1时,y=1-2x-x^2/(x-1),求导,y'=-2-(x^2-2*x)/(x-1)^2=(-3x^2+6x-2)/(x-1)^2
y'≥0时,x≥1+√3/3,或者x≤1-√3/3,因为此时x>1,所以,x≥1+√3/3,增区间
y
y=1-|X-1|分之X方-2X的增区间减区间
x>1时,y=1-2x-x^2/(x-1),求导,y'=-2-(x^2-2*x)/(x-1)^2=(-3x^2+6x-2)/(x-1)^2
y'≥0时,x≥1+√3/3,或者x≤1-√3/3,因为此时x>1,所以,x≥1+√3/3,增区间
y